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Once the program was successfully developed, it was run on a recognizable tune: the first four measures of “Twinkle Twinkle Little Star.” Again, the traditional spectrogram, the reassigned spectrogram, and the MATLAB output are shown below. Each note of the song was correctly identified and output by the system.
Fig 1 The traditional “smeared” spectrogram of “Twinkle Twinkle Little Star”
Fig 1 The reassigned spectrogram of “Twinkle Twinkle Little Star”
Again, the system correctly identified all of the notes of the input signal without error. The first four measures of “Twinkle Twinkle Little Star” are as follows:
Here is the MATLAB output:
Fig 3 The MATLAB output accurately identifying each note
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